Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $30.21 -0.27 (-0.89%) Closing price 08/14/2025 04:00 PM EasternExtended Trading$30.28 +0.06 (+0.22%) As of 05:29 AM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 33.34%, with a year-to-date return of -18.64%. In the past month, the stock has increased 42.63%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $30.21 with a market cap of $1.40 billion and volume of 464,374 shares. Five years ago, the stock traded at $20.34, representing a 48.53% increase over that period. At the time, it had a market cap of $938.75 million and a volume of 169,136 shares. Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Email Address 5 Day Performance+26.88%1 Month Performance+42.63%3 Month Performance+24.22%Year-To-Date Performance-18.64%1 Year Performance-33.34%5 Year Performance+48.53% AMPH Stock Chart for Friday, August, 15, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization08/14/2025$30.48$30.21-0.89%$30.63$29.64464,374 shs$1.40 billion08/13/2025$30.35$30.48+0.43%$31.23$30.001.02 million shs$1.42 billion08/12/2025$27.36$30.35+10.93%$30.63$28.141.60 million shs$1.41 billion08/11/2025$23.81$27.36+14.91%$27.41$24.691.82 million shs$1.27 billion08/08/2025$21.62$23.81+10.13%$24.70$22.071.00 million shs$1.12 billion08/07/2025$20.82$21.62+3.84%$21.74$20.70705,090 shs$1.02 billion08/06/2025$21.44$20.82-2.89%$21.68$20.79414,579 shs$981.46 million08/05/2025$21.40$21.44+0.19%$21.57$21.18388,966 shs$1.01 billion08/04/2025$21.21$21.40+0.90%$21.43$20.88463,650 shs$1.01 billion08/01/2025$20.95$21.21+1.24%$21.25$20.39440,154 shs$999.84 million Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 07/31/2025$21.34$20.95-1.83%$21.33$20.77545,003 shs$987.56 million07/30/2025$21.67$21.34-1.52%$21.84$21.23304,733 shs$1.01 billion07/29/2025$22.24$21.67-2.56%$22.13$21.65358,965 shs$1.02 billion07/28/2025$22.37$22.24-0.58%$22.90$22.06457,570 shs$1.05 billion07/25/2025$22.51$22.37-0.62%$22.50$22.13329,130 shs$1.05 billion07/24/2025$22.63$22.51-0.53%$22.68$22.39320,091 shs$1.06 billion07/23/2025$21.35$22.63+6.00%$22.70$21.51518,064 shs$1.07 billion07/22/2025$21.19$21.35+0.76%$21.70$21.08469,496 shs$1.01 billion07/21/2025$20.62$21.19+2.76%$21.22$20.64536,087 shs$998.90 million07/18/2025$21.70$20.62-4.98%$22.00$20.43430,242 shs$972.03 million07/17/2025$21.27$21.70+2.02%$21.92$21.19407,650 shs$1.02 billion07/16/2025$21.18$21.27+0.42%$21.65$21.09675,607 shs$1.00 billion07/15/2025$21.95$21.18-3.51%$22.31$21.16504,340 shs$998.43 million07/14/2025$21.66$21.95+1.34%$22.12$21.50504,860 shs$1.03 billion Related Companies ACAD Stock Chart ACLX Stock Chart AKRO Stock Chart VKTX Stock Chart MTSR Stock Chart SWTX Stock Chart SRRK Stock Chart MLTX Stock Chart PTGX Stock Chart AAPG Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 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